Bacon.js for Functional Reactive Programming
Solving real world problems
I’m fairly new to Function Programming paradigm. I have been coding with Erlang,Haskel and Scala mostly in my spare time. Let me get this straight. I don’t like when people want to use FP because of mathematical theory. I also hate when people wan’t to code something because language is elegant or beautiful.
They’re not real world problems nor they solve any.
Let me give you a simple example of Bacon.js and what it solves:
In this example there are two input fields. Both needs to have value in order button to be enabled. Simple and very common thing to do.
First we include libraries. JQuery, Bacon.js and Bacon.UI.js. Bacon.UI.js is a helper library that uses Bacon.js. It’s just nice and handy cellofan to keep all easy for programmer.
After that we define one method: nonEmpty. No need to explain more.
Bacon.js takes two input field values with Bacon.UI.textFieldValue helper funtion.
After that, map-function is given nonEmpty function which is evaluated. True/false values streamed to nameEntered and ageEntered variables.
After that and function is used to make sure that both fields are entered, hence true.
After that we bind model to some visible action – Enablig and disabling a button. ButtonEnabled value is assigned to attrmethod with parameter disabled. There’s alsonot, because when both fields are true, we need to enable button (disabled = false).
I’m not going to go deeper details on Bacon.js because author of this library, Juha Paananen aka Raimo Hanska, has excellent blog posts and examples.
Maybe this is the turning point that my head goes more towards FP and see what other problems I can solve with it. Mathematical?
Bacon.js just rewired a part of my brain. And it feels gooood.
ps. Some of the texts are quotes from blog of Juha Paananen. Thanks.
pps. If you did not understand a word what I wrote or you wan’t to know more, please visit:
Bacon.js Tutorial Part I : Hacking With jQuery
Bacon.js Tutorial Part II: Get Started
Bacon.js Tutorial Part III : AJAX and Stuff
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